Download Windows 8.1 Preview

Download Windows 8.1 Preview

You can install Windows 8.1 Preview using the ISO files (.iso) that are provided on this page.

You can find additional information—including system requirements, support options, and a list of supported upgrades—in the FAQ.

How to install Windows 8.1 Preview from an ISO file
To install Windows 8.1 Preview from an ISO file, you must first convert the ISO file into installation media stored on a DVD or a USB flash drive.
If you're using Windows 8, follow these steps to install Windows 8.1 Preview from an ISO file:

Download the ISO (.iso) file.
Double-tap or double-click the ISO file.

Double-tap or double-click setup.exe and follow the steps.

If you're using Windows 7, the easiest way to convert an ISO file to a DVD is to use Windows Disc Image Burner. On a PC running Windows XP or Windows Vista, a third-party program is required to convert an ISO file into installable media—and DVD burning software often includes this capability.

Windows 7 SP1 & Windows 8 Super AIO 40in1 ( Mei 2013/Eng/Multi) | 8 Gb

Name : Windows 7 SP1 & Windows 8
Version : 40in1 ( Mei 2013/Eng/Multi)
Languange : English/Multi
Medicine : Include
OS Support : Windows 8
Password : No
Type File : Rar
Code File : W78AIO.40x1
Updated : 5 Mei 2013
Publisher : Microsoft
Size : 8.4 Gb

Windows 7 and Windows 8 Super AIO

This has no kb files or extra features, and is intended
for IT pros. Even without DaRT8, it wouldn't fit on a
D/L DVDR. I guess if you cut all the N versions, it might
fit, but I designed this more to be used on a USB drive.

Microsoft Diagnostics and Recovery Toolset 8 included in boot options.
Features include System File Scan, Recovery, Backup restore,
Offline hotfix removal, disk cleaning and repartitioning, etc.
(Thank anarchist9027 for this AIO addition)

Windows 7 SP1 AIO 41 in1 (x64/x86/March2013) | 6 Gb

 Name : Windows 7 SP1

Version : AIO 41 in1
Languange : English
Medicine : Include
OS Support : Xp/Vista/7
Password : No
Type File : rar
Code File : 7.SP1.AIO.41in1.Mar.2013
Updated : March 2013
Publisher : Microsoft
Size : 6 Gb

This AIO supports Windows Upgrade from previous Windows Versions. Hot-fixes included bring install current to March 2013 patch date ,Internet Explorer 10, .Net Framework 4.5, Network Drivers and USB3 Support Added. 

Info
This release is the best you could find on the net, because it's just simple:

    No Windows 7 Settings were harmed in the making of this ISO.
    No Programs are added to Windows.
    No Unattended Settings were added to the installation.
    No Registry Settings were modified.

How To Activation Windows 8 AIO Orion

1.) Run the command prompt as administrator (start menu, type cmd, right click, run as administrator)

2.) Type:
slmgr / upk
slmgr / rearm

3.) Restart

4.) Reopen the command prompt in admin

5.) Type:
slmgr-skms 147.134.1.42:1688
slmgr-ipk "8 PRO FOR WINDOWS KEY IS-NG4HW VH26C-733KW-K6F98-J8CK4 FOR NOW IS-32JNW 9KQ84-P47T8-D8GGY-CWCK7" "FOR PRO MEDIA CENTER IS-C7MCR 3R9N7-KX8YH-2X4QC-D668D GGKFW-OR-TBH8R H8R6B-NDT88-K2BRQ "(without the quotes)
slmgr-ato

Windows 8 AIO Orion (x86/x64/April/2013) | 4.7 Gb

Name : Windows 8 AIO Orion
Version : Orion  (x86/x64/April/2013)
Languange : English/French
Medicine : Include - Key
OS Support : Xp/Vista/7/8
Password : No
Type File : rar
Code File : a.i.o.0rion.4-2013
Updated : April 2013
Publisher : Anonymouse
Size : 4.7 Gb

Configuration Minimal :

Windows 8 32bits
1 gigahertz (GHZ)
1 gigabyte (GB) RAM
12 GB available hard disk space

Windows 8 64bits
1 gigahertz (GHZ)
2 gigabyte (GB) RAM
16 GB available hard disk space